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/// @ref gtc_round
#include "../integer.hpp"
#include "../ext/vector_integer.hpp"
namespace glm{
namespace detail
{
template<bool is_float, bool is_signed>
struct compute_roundMultiple {};
template<>
struct compute_roundMultiple<true, true>
{
template<typename genType>
GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
{
if (Source >= genType(0))
return Source - std::fmod(Source, Multiple);
else
{
genType Tmp = Source + genType(1);
return Tmp - std::fmod(Tmp, Multiple) - Multiple;
}
}
};
template<>
struct compute_roundMultiple<false, false>
{
template<typename genType>
GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
{
if (Source >= genType(0))
return Source - Source % Multiple;
else
{
genType Tmp = Source + genType(1);
return Tmp - Tmp % Multiple - Multiple;
}
}
};
template<>
struct compute_roundMultiple<false, true>
{
template<typename genType>
GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
{
if (Source >= genType(0))
return Source - Source % Multiple;
else
{
genType Tmp = Source + genType(1);
return Tmp - Tmp % Multiple - Multiple;
}
}
};
}//namespace detail
//////////////////
// ceilPowerOfTwo
template<typename genType>
GLM_FUNC_QUALIFIER genType ceilPowerOfTwo(genType value)
{
return detail::compute_ceilPowerOfTwo<1, genType, defaultp, std::numeric_limits<genType>::is_signed>::call(vec<1, genType, defaultp>(value)).x;
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> ceilPowerOfTwo(vec<L, T, Q> const& v)
{
return detail::compute_ceilPowerOfTwo<L, T, Q, std::numeric_limits<T>::is_signed>::call(v);
}
///////////////////
// floorPowerOfTwo
template<typename genType>
GLM_FUNC_QUALIFIER genType floorPowerOfTwo(genType value)
{
return isPowerOfTwo(value) ? value : static_cast<genType>(1) << findMSB(value);
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> floorPowerOfTwo(vec<L, T, Q> const& v)
{
return detail::functor1<vec, L, T, T, Q>::call(floorPowerOfTwo, v);
}
///////////////////
// roundPowerOfTwo
template<typename genIUType>
GLM_FUNC_QUALIFIER genIUType roundPowerOfTwo(genIUType value)
{
if(isPowerOfTwo(value))
return value;
genIUType const prev = static_cast<genIUType>(1) << findMSB(value);
genIUType const next = prev << static_cast<genIUType>(1);
return (next - value) < (value - prev) ? next : prev;
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> roundPowerOfTwo(vec<L, T, Q> const& v)
{
return detail::functor1<vec, L, T, T, Q>::call(roundPowerOfTwo, v);
}
//////////////////////
// ceilMultiple
template<typename genType>
GLM_FUNC_QUALIFIER genType ceilMultiple(genType Source, genType Multiple)
{
return detail::compute_ceilMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> ceilMultiple(vec<L, T, Q> const& Source, vec<L, T, Q> const& Multiple)
{
return detail::functor2<vec, L, T, Q>::call(ceilMultiple, Source, Multiple);
}
//////////////////////
// floorMultiple
template<typename genType>
GLM_FUNC_QUALIFIER genType floorMultiple(genType Source, genType Multiple)
{
return detail::compute_floorMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> floorMultiple(vec<L, T, Q> const& Source, vec<L, T, Q> const& Multiple)
{
return detail::functor2<vec, L, T, Q>::call(floorMultiple, Source, Multiple);
}
//////////////////////
// roundMultiple
template<typename genType>
GLM_FUNC_QUALIFIER genType roundMultiple(genType Source, genType Multiple)
{
return detail::compute_roundMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> roundMultiple(vec<L, T, Q> const& Source, vec<L, T, Q> const& Multiple)
{
return detail::functor2<vec, L, T, Q>::call(roundMultiple, Source, Multiple);
}
}//namespace glm
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